Breaking-change: fully remove split derived files feature

Author: luispadron

swift/internal/action_names.bzl

@@ -34,10 +34,6 @@ SWIFT_ACTION_COMPILE_MODULE = "SwiftCompileModule"
 # Compiles a `.swiftinterface` file into a `.swiftmodule` file.
 SWIFT_ACTION_COMPILE_MODULE_INTERFACE = "SwiftCompileModuleInterface"
 
-# Produces files that are usually fallout of the compilation such as
-# .swiftmodule, -Swift.h and more.
-SWIFT_ACTION_DERIVE_FILES = "SwiftDeriveFiles"
-
 # Produces an AST file for each swift source file in a module.
 SWIFT_ACTION_DUMP_AST = "SwiftDumpAST"
 
@@ -65,7 +61,6 @@ def all_action_names():
         SWIFT_ACTION_COMPILE_CODEGEN,
         SWIFT_ACTION_COMPILE_MODULE,
         SWIFT_ACTION_COMPILE_MODULE_INTERFACE,
-        SWIFT_ACTION_DERIVE_FILES,
         SWIFT_ACTION_DUMP_AST,
         SWIFT_ACTION_MODULEWRAP,
         SWIFT_ACTION_PRECOMPILE_C_MODULE,
@@ -77,7 +72,6 @@ def all_compile_action_names():
     """Returns all actions that compile source files."""
     return [
         SWIFT_ACTION_COMPILE,
-        SWIFT_ACTION_DERIVE_FILES,
         SWIFT_ACTION_COMPILE_CODEGEN,
         SWIFT_ACTION_COMPILE_MODULE,
     ]

swift/internal/compiling.bzl

@@ -31,7 +31,6 @@ load(
     "SWIFT_ACTION_COMPILE_CODEGEN",
     "SWIFT_ACTION_COMPILE_MODULE",
     "SWIFT_ACTION_COMPILE_MODULE_INTERFACE",
-    "SWIFT_ACTION_DERIVE_FILES",
     "SWIFT_ACTION_DUMP_AST",
     "SWIFT_ACTION_PRECOMPILE_C_MODULE",
 )

swift/internal/feature_names.bzl

@@ -336,10 +336,6 @@ SWIFT_FEATURE_GENERATE_FROM_RAW_PROTO_FILES = "swift.generate_from_raw_proto_fil
 # generating a Swift file from a proto file.
 SWIFT_FEATURE_GENERATE_PATH_TO_UNDERSCORES_FROM_PROTO_FILES = "swift.generate_path_to_underscores_from_proto_files"
 
-# If enabled the skip function bodies frontend flag is passed when using derived
-# files generation. This requires Swift 5.2
-SWIFT_FEATURE_ENABLE_SKIP_FUNCTION_BODIES = "swift.skip_function_bodies_for_derived_files"
-
 # If enabled remap the absolute path to Xcode in debug info. When used with
 # swift.coverage_prefix_map also remap the path in coverage data.
 SWIFT_FEATURE_REMAP_XCODE_PATH = "swift.remap_xcode_path"

swift/internal/features.bzl

@@ -27,7 +27,6 @@ load(
     "SWIFT_FEATURE_EMIT_SWIFTDOC",
     "SWIFT_FEATURE_ENABLE_BARE_SLASH_REGEX",
     "SWIFT_FEATURE_ENABLE_BATCH_MODE",
-    "SWIFT_FEATURE_ENABLE_SKIP_FUNCTION_BODIES",
     "SWIFT_FEATURE_ENABLE_TESTING",
     "SWIFT_FEATURE_ENABLE_V6",
     "SWIFT_FEATURE_FILE_PREFIX_MAP",
@@ -279,7 +278,6 @@ def default_features_for_toolchain(target_triple):
         SWIFT_FEATURE_EMIT_SWIFTDOC,
         SWIFT_FEATURE_ENABLE_BARE_SLASH_REGEX,
         SWIFT_FEATURE_ENABLE_BATCH_MODE,
-        SWIFT_FEATURE_ENABLE_SKIP_FUNCTION_BODIES,
         SWIFT_FEATURE_FILE_PREFIX_MAP,
         SWIFT_FEATURE_INTERNALIZE_AT_LINK,
         SWIFT_FEATURE_OPT_USES_WMO,